kvm/kernel/include/linux/kvm_host.h

   1 #ifndef KVM_UNIFDEF_H
   2 #define KVM_UNIFDEF_H
   3
   4 #ifdef __i386__
   5 #ifndef CONFIG_X86_32
   6 #define CONFIG_X86_32 1
   7 #endif
   8 #endif
   9
  10 #ifdef __x86_64__
  11 #ifndef CONFIG_X86_64
  12 #define CONFIG_X86_64 1
  13 #endif
  14 #endif
  15
  16 #if defined(__i386__) || defined (__x86_64__)
  17 #ifndef CONFIG_X86
  18 #define CONFIG_X86 1
  19 #endif
  20 #endif
  21
  22 #ifdef __ia64__
  23 #ifndef CONFIG_IA64
  24 #define CONFIG_IA64 1
  25 #endif
  26 #endif
  27
  28 #ifdef __PPC__
  29 #ifndef CONFIG_PPC
  30 #define CONFIG_PPC 1
  31 #endif
  32 #endif
  33
  34 #ifdef __s390__
  35 #ifndef CONFIG_S390
  36 #define CONFIG_S390 1
  37 #endif
  38 #endif
  39
  40 #endif
  41 #ifndef __KVM_HOST_H
  42 #define __KVM_HOST_H
  43
  44 /*
  45  * This work is licensed under the terms of the GNU GPL, version 2.  See
  46  * the COPYING file in the top-level directory.
  47  */
  48
  49 #include <linux/types.h>
  50 #include <linux/hardirq.h>
  51 #include <linux/list.h>
  52 #include <linux/mutex.h>
  53 #include <linux/spinlock.h>
  54 #include <linux/signal.h>
  55 #include <linux/sched.h>
  56 #include <linux/mm.h>
  57 #include <linux/preempt.h>
  58 #include <linux/marker.h>
  59 #include <linux/msi.h>
  60 #include <asm/signal.h>
  61
  62 #include <linux/kvm.h>
  63 #include <linux/kvm_para.h>
  64
  65 #include <linux/kvm_types.h>
  66
  67 #include <asm/kvm_host.h>
  68
  69 /*
  70  * vcpu->requests bit members
  71  */
  72 #define KVM_REQ_TLB_FLUSH          0
  73 #define KVM_REQ_MIGRATE_TIMER      1
  74 #define KVM_REQ_REPORT_TPR_ACCESS  2
  75 #define KVM_REQ_MMU_RELOAD         3
  76 #define KVM_REQ_TRIPLE_FAULT       4
  77 #define KVM_REQ_PENDING_TIMER      5
  78 #define KVM_REQ_UNHALT             6
  79 #define KVM_REQ_MMU_SYNC           7
  80 #define KVM_REQ_KVMCLOCK_UPDATE    8
  81
  82 #define KVM_USERSPACE_IRQ_SOURCE_ID     0
  83
  84 struct kvm_vcpu;
  85 extern struct kmem_cache *kvm_vcpu_cache;
  86
  87 /*
  88  * It would be nice to use something smarter than a linear search, TBD...
  89  * Thankfully we dont expect many devices to register (famous last words :),
  90  * so until then it will suffice.  At least its abstracted so we can change
  91  * in one place.
  92  */
  93 struct kvm_io_bus {
  94         int                   dev_count;
  95 #define NR_IOBUS_DEVS 6
  96         struct kvm_io_device *devs[NR_IOBUS_DEVS];
  97 };
  98
  99 void kvm_io_bus_init(struct kvm_io_bus *bus);
 100 void kvm_io_bus_destroy(struct kvm_io_bus *bus);
 101 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
 102                                           gpa_t addr, int len, int is_write);
 103 void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
 104                              struct kvm_io_device *dev);
 105
 106 struct kvm_vcpu {
 107         struct kvm *kvm;
 108 #ifdef CONFIG_PREEMPT_NOTIFIERS
 109         struct preempt_notifier preempt_notifier;
 110 #endif
 111         int vcpu_id;
 112         struct mutex mutex;
 113         int   cpu;
 114         struct kvm_run *run;
 115         int guest_mode;
 116         unsigned long requests;
 117         unsigned long guest_debug;
 118         int fpu_active;
 119         int guest_fpu_loaded;
 120         wait_queue_head_t wq;
 121         int sigset_active;
 122         sigset_t sigset;
 123         struct kvm_vcpu_stat stat;
 124
 125 #ifdef CONFIG_HAS_IOMEM
 126         int mmio_needed;
 127         int mmio_read_completed;
 128         int mmio_is_write;
 129         int mmio_size;
 130         unsigned char mmio_data[8];
 131         gpa_t mmio_phys_addr;
 132 #endif
 133
 134         struct kvm_vcpu_arch arch;
 135 };
 136
 137 struct kvm_memory_slot {
 138         gfn_t base_gfn;
 139         unsigned long npages;
 140         unsigned long flags;
 141         unsigned long *rmap;
 142         unsigned long *dirty_bitmap;
 143         struct {
 144                 unsigned long rmap_pde;
 145                 int write_count;
 146         } *lpage_info;
 147         unsigned long userspace_addr;
 148         int user_alloc;
 149 };
 150
 151 struct kvm_kernel_irq_routing_entry {
 152         u32 gsi;
 153         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 154                     struct kvm *kvm, int level);
 155         union {
 156                 struct {
 157                         unsigned irqchip;
 158                         unsigned pin;
 159                 } irqchip;
 160                 struct msi_msg msi;
 161         };
 162         struct list_head link;
 163 };
 164
 165 struct kvm {
 166         struct mutex lock; /* protects the vcpus array and APIC accesses */
 167         spinlock_t mmu_lock;
 168         struct rw_semaphore slots_lock;
 169         struct mm_struct *mm; /* userspace tied to this vm */
 170         int nmemslots;
 171         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
 172                                         KVM_PRIVATE_MEM_SLOTS];
 173         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 174         struct list_head vm_list;
 175         struct kvm_io_bus mmio_bus;
 176         struct kvm_io_bus pio_bus;
 177         struct kvm_vm_stat stat;
 178         struct kvm_arch arch;
 179         atomic_t users_count;
 180 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 181         struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
 182         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 183 #endif
 184
 185 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 186         struct list_head irq_routing; /* of kvm_kernel_irq_routing_entry */
 187         struct hlist_head mask_notifier_list;
 188 #endif
 189
 190 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 191         struct mmu_notifier mmu_notifier;
 192         unsigned long mmu_notifier_seq;
 193         long mmu_notifier_count;
 194 #endif
 195 };
 196
 197 /* The guest did something we don't support. */
 198 #define pr_unimpl(vcpu, fmt, ...)                                       \
 199  do {                                                                   \
 200         if (printk_ratelimit())                                         \
 201                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 202                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 203  } while (0)
 204
 205 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 206 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 207
 208 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 209 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 210
 211 void vcpu_load(struct kvm_vcpu *vcpu);
 212 void vcpu_put(struct kvm_vcpu *vcpu);
 213
 214 int kvm_init(void *opaque, unsigned int vcpu_size,
 215                   struct module *module);
 216 void kvm_exit(void);
 217
 218 void kvm_get_kvm(struct kvm *kvm);
 219 void kvm_put_kvm(struct kvm *kvm);
 220
 221 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 222 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 223 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 224 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 225
 226 extern struct page *bad_page;
 227 extern pfn_t bad_pfn;
 228
 229 int is_error_page(struct page *page);
 230 int is_error_pfn(pfn_t pfn);
 231 int kvm_is_error_hva(unsigned long addr);
 232 int kvm_set_memory_region(struct kvm *kvm,
 233                           struct kvm_userspace_memory_region *mem,
 234                           int user_alloc);
 235 int __kvm_set_memory_region(struct kvm *kvm,
 236                             struct kvm_userspace_memory_region *mem,
 237                             int user_alloc);
 238 int kvm_arch_set_memory_region(struct kvm *kvm,
 239                                 struct kvm_userspace_memory_region *mem,
 240                                 struct kvm_memory_slot old,
 241                                 int user_alloc);
 242 void kvm_arch_flush_shadow(struct kvm *kvm);
 243 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
 244 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 245 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 246 void kvm_release_page_clean(struct page *page);
 247 void kvm_release_page_dirty(struct page *page);
 248 void kvm_set_page_dirty(struct page *page);
 249 void kvm_set_page_accessed(struct page *page);
 250
 251 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 252 void kvm_release_pfn_dirty(pfn_t);
 253 void kvm_release_pfn_clean(pfn_t pfn);
 254 void kvm_set_pfn_dirty(pfn_t pfn);
 255 void kvm_set_pfn_accessed(pfn_t pfn);
 256 void kvm_get_pfn(pfn_t pfn);
 257
 258 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 259                         int len);
 260 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 261                           unsigned long len);
 262 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 263 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 264                          int offset, int len);
 265 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 266                     unsigned long len);
 267 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 268 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 269 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 270 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 271 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 272
 273 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 274 void kvm_resched(struct kvm_vcpu *vcpu);
 275 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 276 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 277 void kvm_flush_remote_tlbs(struct kvm *kvm);
 278 void kvm_reload_remote_mmus(struct kvm *kvm);
 279
 280 long kvm_arch_dev_ioctl(struct file *filp,
 281                         unsigned int ioctl, unsigned long arg);
 282 long kvm_arch_vcpu_ioctl(struct file *filp,
 283                          unsigned int ioctl, unsigned long arg);
 284 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 285 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 286
 287 int kvm_dev_ioctl_check_extension(long ext);
 288
 289 int kvm_get_dirty_log(struct kvm *kvm,
 290                         struct kvm_dirty_log *log, int *is_dirty);
 291 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 292                                 struct kvm_dirty_log *log);
 293
 294 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 295                                    struct
 296                                    kvm_userspace_memory_region *mem,
 297                                    int user_alloc);
 298 long kvm_arch_vm_ioctl(struct file *filp,
 299                        unsigned int ioctl, unsigned long arg);
 300
 301 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 302 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 303
 304 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 305                                     struct kvm_translation *tr);
 306
 307 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 308 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 309 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 310                                   struct kvm_sregs *sregs);
 311 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 312                                   struct kvm_sregs *sregs);
 313 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 314                                     struct kvm_mp_state *mp_state);
 315 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 316                                     struct kvm_mp_state *mp_state);
 317 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 318                                         struct kvm_guest_debug *dbg);
 319 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 320
 321 int kvm_arch_init(void *opaque);
 322 void kvm_arch_exit(void);
 323
 324 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 325 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 326
 327 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 328 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 329 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 330 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 331 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 332 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 333
 334 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
 335 void kvm_arch_hardware_enable(void *garbage);
 336 void kvm_arch_hardware_disable(void *garbage);
 337 int kvm_arch_hardware_setup(void);
 338 void kvm_arch_hardware_unsetup(void);
 339 void kvm_arch_check_processor_compat(void *rtn);
 340 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 341 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 342
 343 void kvm_free_physmem(struct kvm *kvm);
 344
 345 struct  kvm *kvm_arch_create_vm(void);
 346 void kvm_arch_destroy_vm(struct kvm *kvm);
 347 void kvm_free_all_assigned_devices(struct kvm *kvm);
 348 void kvm_arch_sync_events(struct kvm *kvm);
 349
 350 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
 351 int kvm_cpu_has_interrupt(struct kvm_vcpu *v);
 352 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 353 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 354
 355 int kvm_is_mmio_pfn(pfn_t pfn);
 356
 357 struct kvm_irq_ack_notifier {
 358         struct hlist_node link;
 359         unsigned gsi;
 360         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 361 };
 362
 363 #define KVM_ASSIGNED_MSIX_PENDING               0x1
 364 struct kvm_guest_msix_entry {
 365         u32 vector;
 366         u16 entry;
 367         u16 flags;
 368 };
 369
 370 struct kvm_assigned_dev_kernel {
 371         struct kvm_irq_ack_notifier ack_notifier;
 372         struct work_struct interrupt_work;
 373         struct list_head list;
 374         int assigned_dev_id;
 375         int host_busnr;
 376         int host_devfn;
 377         unsigned int entries_nr;
 378         int host_irq;
 379         bool host_irq_disabled;
 380         struct msix_entry *host_msix_entries;
 381         int guest_irq;
 382         struct kvm_guest_msix_entry *guest_msix_entries;
 383         unsigned long irq_requested_type;
 384         int irq_source_id;
 385         int flags;
 386         struct pci_dev *dev;
 387         struct kvm *kvm;
 388 };
 389
 390 struct kvm_irq_mask_notifier {
 391         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 392         int irq;
 393         struct hlist_node link;
 394 };
 395
 396 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 397                                     struct kvm_irq_mask_notifier *kimn);
 398 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 399                                       struct kvm_irq_mask_notifier *kimn);
 400 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);
 401
 402 #ifdef __KVM_HAVE_IOAPIC
 403 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
 404                                    union kvm_ioapic_redirect_entry *entry,
 405                                    unsigned long *deliver_bitmask);
 406 #endif
 407 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level);
 408 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 409 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 410                                    struct kvm_irq_ack_notifier *kian);
 411 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian);
 412 int kvm_request_irq_source_id(struct kvm *kvm);
 413 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 414
 415 #ifdef CONFIG_IOMMU_API
 416 int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,
 417                         unsigned long npages);
 418 int kvm_iommu_map_guest(struct kvm *kvm);
 419 int kvm_iommu_unmap_guest(struct kvm *kvm);
 420 int kvm_assign_device(struct kvm *kvm,
 421                       struct kvm_assigned_dev_kernel *assigned_dev);
 422 int kvm_deassign_device(struct kvm *kvm,
 423                         struct kvm_assigned_dev_kernel *assigned_dev);
 424 #else /* CONFIG_IOMMU_API */
 425 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 426                                       gfn_t base_gfn,
 427                                       unsigned long npages)
 428 {
 429         return 0;
 430 }
 431
 432 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 433 {
 434         return -ENODEV;
 435 }
 436
 437 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 438 {
 439         return 0;
 440 }
 441
 442 static inline int kvm_assign_device(struct kvm *kvm,
 443                 struct kvm_assigned_dev_kernel *assigned_dev)
 444 {
 445         return 0;
 446 }
 447
 448 static inline int kvm_deassign_device(struct kvm *kvm,
 449                 struct kvm_assigned_dev_kernel *assigned_dev)
 450 {
 451         return 0;
 452 }
 453 #endif /* CONFIG_IOMMU_API */
 454
 455 static inline void kvm_guest_enter(void)
 456 {
 457         account_system_vtime(current);
 458         current->flags |= PF_VCPU;
 459 }
 460
 461 static inline void kvm_guest_exit(void)
 462 {
 463         account_system_vtime(current);
 464         current->flags &= ~PF_VCPU;
 465 }
 466
 467 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 468 {
 469         return slot - kvm->memslots;
 470 }
 471
 472 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 473 {
 474         return (gpa_t)gfn << PAGE_SHIFT;
 475 }
 476
 477 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 478 {
 479         return (hpa_t)pfn << PAGE_SHIFT;
 480 }
 481
 482 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 483 {
 484         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 485 }
 486
 487 enum kvm_stat_kind {
 488         KVM_STAT_VM,
 489         KVM_STAT_VCPU,
 490 };
 491
 492 struct kvm_stats_debugfs_item {
 493         const char *name;
 494         int offset;
 495         enum kvm_stat_kind kind;
 496         struct dentry *dentry;
 497 };
 498 extern struct kvm_stats_debugfs_item debugfs_entries[];
 499 extern struct dentry *kvm_debugfs_dir;
 500
 501 #define KVMTRACE_5D(evt, vcpu, d1, d2, d3, d4, d5, name) \
 502         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 503                                                 vcpu, 5, d1, d2, d3, d4, d5)
 504 #define KVMTRACE_4D(evt, vcpu, d1, d2, d3, d4, name) \
 505         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 506                                                 vcpu, 4, d1, d2, d3, d4, 0)
 507 #define KVMTRACE_3D(evt, vcpu, d1, d2, d3, name) \
 508         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 509                                                 vcpu, 3, d1, d2, d3, 0, 0)
 510 #define KVMTRACE_2D(evt, vcpu, d1, d2, name) \
 511         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 512                                                 vcpu, 2, d1, d2, 0, 0, 0)
 513 #define KVMTRACE_1D(evt, vcpu, d1, name) \
 514         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 515                                                 vcpu, 1, d1, 0, 0, 0, 0)
 516 #define KVMTRACE_0D(evt, vcpu, name) \
 517         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 518                                                 vcpu, 0, 0, 0, 0, 0, 0)
 519
 520 #ifdef CONFIG_KVM_TRACE
 521 int kvm_trace_ioctl(unsigned int ioctl, unsigned long arg);
 522 void kvm_trace_cleanup(void);
 523 #else
 524 static inline
 525 int kvm_trace_ioctl(unsigned int ioctl, unsigned long arg)
 526 {
 527         return -EINVAL;
 528 }
 529 #define kvm_trace_cleanup() ((void)0)
 530 #endif
 531
 532 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 533 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 534 {
 535         if (unlikely(vcpu->kvm->mmu_notifier_count))
 536                 return 1;
 537         /*
 538          * Both reads happen under the mmu_lock and both values are
 539          * modified under mmu_lock, so there's no need of smb_rmb()
 540          * here in between, otherwise mmu_notifier_count should be
 541          * read before mmu_notifier_seq, see
 542          * mmu_notifier_invalidate_range_end write side.
 543          */
 544         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
 545                 return 1;
 546         return 0;
 547 }
 548 #endif
 549
 550 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 551
 552 #define KVM_MAX_IRQ_ROUTES 1024
 553
 554 int kvm_setup_default_irq_routing(struct kvm *kvm);
 555 int kvm_set_irq_routing(struct kvm *kvm,
 556                         const struct kvm_irq_routing_entry *entries,
 557                         unsigned nr,
 558                         unsigned flags);
 559 void kvm_free_irq_routing(struct kvm *kvm);
 560
 561 #else
 562
 563 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 564
 565 #endif
 566
 567 #endif